You should first see if the transmission shifter is moving through all the gears by the gear shifter and the cable and connections are okay. Then make sure the fluid is full. If all this checks out, then you may have a broken internal one way clutch and the transmission needs to be overhauled or replaced.

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What others are asking

Q: losing acceleration

You've done all the right things, and I presume you replaced the entire exhaust. If not, I would suspect there is a blockage in the catalyst. Other things that come to mind are rust in the fuel system. or, believe...

Q: CAR JUST REVS IN REVERSE, DOENS'T MOVE.

This is a known issue with the Chevy Malibu and is oftentimes related to the pressure control valve in the transmission. The pressure control valve regulates the flow of transmission fluid in the transmission and when it is not working...

Q: Gear box top loader 4 speed issues.

Hi there. It seems that the ball joint on the top of the transmission has broke or lost the brass pin. Remove the shifter and check the brass pins on the shifter handle. See if they are bent or broken...

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